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Data & Analytics · Intermediate

Redis

An in-memory key-value data store supporting strings, hashes, lists, sets, sorted sets and streams, widely used for caching.

Definition

Redis offers sub-millisecond latency, pub/sub, TTL expiry, and optional persistence (RDB and AOF). Managed versions include Amazon ElastiCache and MemoryDB, Azure Cache for Redis / Azure Managed Redis and Google Memorystore. Valkey is the open-source fork that followed Redis's 2024 license change.

Example

ZADD leaderboard 1500 player42

Exam tip

Sorted sets make Redis the classic answer for real-time leaderboards.

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